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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819817f9a92c448a6011b0db98a361197d62ff02ae92b76b3786d3b890717b8d' 
  AND token = 'dwaZDw0LzE/Q/AQ1wqgSNA6miD9BhlQS3k8iKlpVG/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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