SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd80f41afc2e618f6be04abd7ef274e6f96bcf6774d84b205806c1159c85e7a' 
  AND token = 'm/+na1QWjXMzxKMG9RQTkL86BZhK3Gll3Jx467UqPWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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