SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'ja' 
  AND lang.name IN (
    'my_cart', 'items', 'for', 'my_cart', 
    'cart_is_empty', 'cart_is_empty', 
    'view_cart', 'checkout', 'my_cart', 
    'items', 'for', 'my_cart', 'cart_is_empty', 
    'cart_is_empty', 'view_cart', 'checkout'
  )

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.01122386,
    "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": 6,
          "cost": 0.01122386,
          "filtered": 100,
          "attached_condition": "lang.lang_code = 'ja' and lang.`name` in ('my_cart','items','for','my_cart','cart_is_empty','cart_is_empty','view_cart','checkout','my_cart','items','for','my_cart','cart_is_empty','cart_is_empty','view_cart','checkout')"
        }
      }
    ]
  }
}