SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 10157 
  AND combination_hash = '235199290'

Query time 0.00043

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_options_inventory const PRIMARY,pc PRIMARY 4 const 1

Result

product_id product_code combination_hash combination amount temp position price weight min_qty max_qty qty_step list_qty_count aval_status
10157 SKY-S+TB-0507-S 235199290 614_15104 0.00 N 1 1254.00 25.55 0 0 0 0 3