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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50faf38b7ffad08e9a63e5454ce7fb71c5c05cb3bed95d7ec05c451fcb0ba992' 
  AND token = 'xKCXjMQEMtc5u0chEBa4Vu6ltLZfo0GniGF85qvNC34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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