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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663ad3e1e1ab1dd8ea715e5c0d21c02894ab6b6bb6bc1534704b923369eb5a63' 
  AND token = 'tzoYrl7+h6H77jh9pxGiNes4F24N0Z6LOrr0ghLutCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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