SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 10076 
  AND combination_hash = '1902004866'

Query time 0.00106

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
10076 ODV-GLU-FK06-0051B 1902004866 1123_21278 0.00 N 0 1591.06 43.00 0 0 0 0 2