SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'zh' 
  AND lang.name IN (
    'text_gift_cert_amount_alert', 'recipients_name', 
    'purchasers_name', 'amount', 'gift_comment', 
    'text_no_products_defined', 'gift_add_products', 
    'how_to_send', 'send_via_email', 
    'send_via_postal_mail', 'gift_certificates.recipient_email', 
    'template', 'address', 'city', 'country', 
    'select_country', 'state', 'select_state', 
    'zip_postal_code', 'schedule_gift_certificate', 
    'preview', 'purchase_gift_certificate', 
    'gift_certificate', 'text_gift_cert_amount_alert', 
    'recipients_name', 'purchasers_name', 
    'amount', 'gift_comment', 'text_no_products_defined', 
    'gift_add_products', 'how_to_send', 
    'send_via_email', 'send_via_postal_mail', 
    'gift_certificates.recipient_email', 
    'template', 'address', 'city', 'country', 
    'select_country', 'state', 'select_state', 
    'zip_postal_code', 'schedule_gift_certificate', 
    'preview', 'purchase_gift_certificate', 
    'gift_certificate'
  )

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.04078329,
    "nested_loop": [
      {
        "table": {
          "table_name": "lang",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "392",
          "used_key_parts": ["lang_code", "name"],
          "loops": 1,
          "rows": 23,
          "cost": 0.04078329,
          "filtered": 100,
          "attached_condition": "lang.lang_code = 'zh' and lang.`name` in ('text_gift_cert_amount_alert','recipients_name','purchasers_name','amount','gift_comment','text_no_products_defined','gift_add_products','how_to_send','send_via_email','send_via_postal_mail','gift_certificates.recipient_email','template','address','city','country','select_country','state','select_state','zip_postal_code','schedule_gift_certificate','preview','purchase_gift_certificate','gift_certificate','text_gift_cert_amount_alert','recipients_name','purchasers_name','amount','gift_comment','text_no_products_defined','gift_add_products','how_to_send','send_via_email','send_via_postal_mail','gift_certificates.recipient_email','template','address','city','country','select_country','state','select_state','zip_postal_code','schedule_gift_certificate','preview','purchase_gift_certificate','gift_certificate')"
        }
      }
    ]
  }
}