SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'downloads', 'view_comparison_list', 
    'track_my_order', 'track_my_order', 
    'order_id', 'go', 'cart_is_empty', 
    'view_cart', 'checkout', 'sg_modern_theme.bag', 
    'downloads', 'view_comparison_list', 
    'track_my_order', 'track_my_order', 
    'order_id', 'go', 'cart_is_empty', 
    'view_cart', 'checkout', 'sg_modern_theme.bag'
  )

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.01644023,
    "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": 9,
          "cost": 0.01644023,
          "filtered": 100,
          "attached_condition": "lang.lang_code = 'en' and lang.`name` in ('downloads','view_comparison_list','track_my_order','track_my_order','order_id','go','cart_is_empty','view_cart','checkout','sg_modern_theme.bag','downloads','view_comparison_list','track_my_order','track_my_order','order_id','go','cart_is_empty','view_cart','checkout','sg_modern_theme.bag')"
        }
      }
    ]
  }
}