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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5438038319b7179e930d75ac5bcadbeb550bda77d528b56b1c2bfc8fe9f72dee' 
  AND token = '1HoAQjRw7qeW+mA0h+UFExTrSgqsRfWUHzg/CE00yNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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