SELECT 
  rating 
FROM 
  cscart_manual_rating 
WHERE 
  `object_id` = 3 
  AND `object_type` = 'company'

Query time 0.00089

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_manual_rating const PRIMARY PRIMARY 102 const,const 1

Result

rating
0