SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 641 
  AND combination_hash = '1066915089'

Query time 0.00026

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
641 MDM-OP-UU-8004 1066915089 1218_22769 0.00 N 0 19.77 5.00 0 0 0 0 100