SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef93f7f5c4eca3632b326f393c6181ea1b4a41d20724ec769cedd27d33d6bbe1' 
  AND token = 'ZRG5LcN2P4ZzYl2Oh+pFZqCQRHdwj2nhzYtxS/WYnZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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