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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f1ef3c224560e0dabde049bb8caf061b50268445edd858245ba2f45b0d3fd9' 
  AND token = 'IgFKdi/VnId4x+SC1yIKRlPr3oUbaOlzE/6pFrNq+ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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