SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 566 
  AND combination_hash = '2862459499'

Query time 0.00029

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
566 eps-dp-th-20 2862459499 343_7745 0.00 N 20 8.76 5.00 1 0 15 0 0