SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226d41d7d2b31b50a9e51385fd492c0ed0a4ef9424c9f18f72aa9eba35feffc3' 
  AND token = 'YH+qQjRHrhYOmsxkJCvpMzWru6HU0SwtiOPiGl5yRM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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