SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd7e149146235a1d6a8f14731816cbdeac5635571ad492f694e6997f196ff19' 
  AND token = 'Q/HEvL6+DvRWw0iHGEaSvzjx9LpsUUhFmDM3sSs/YZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}