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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040613f10944e8369a178c132431990a673604673e690852b45a8dd3dd8067ab' 
  AND token = 'iZpmV9/uuARmHU/bI2bZWbkCLDDlbXVFFmF+OboAP7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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