SELECT 
  * 
FROM 
  cscart_bm_layouts 
WHERE 
  1 
  AND cscart_bm_layouts.company_id = 2 
  AND is_default = 1 
  AND theme_name = 'responsive'

Query time 0.00027

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_bm_layouts ref is_default is_default 5 const,const 2 Using where

Result

layout_id name is_default width theme_name style_id company_id layout_width min_width max_width
10 Main 1 16 responsive Byggbay 2 fluid 320 1440