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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea8aca3ab52a57753c5e62892e3e2ee3a9b765a4714c842a4c8640ef95f296a' 
  AND token = 'zlyktBJbdEZumTZ7TfcjHR8Tp1MPX7uNRKknjHe4QJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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