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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3caa7036fd4efa5515c80a78a288d04ddd9469c4e802cf191b56a849f42df9' 
  AND token = '2VE8m3bPOYssnvd2veLT69J6xzpgixo90EAPTHWYGYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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