SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4167760d5d60deb3bc53122f6a37594a48693a4bb4c21978a381486af844203b' 
  AND token = 'vP1eZDxHoI7g3JYVgIsO2NC2gR9A1y+Z/TJvAUqKT3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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