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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022cdbc0147081b784b1821d2b61d2addd2a03d493537b0583ec57ee530cf844' 
  AND token = '1Y0i3iaxIf/ClLACOmOrZ+HrZ1xv8W6WTw8Yuwu/fuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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