Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e6c8eba629c22c16964dcf3ac415e3d8fc1273dcfdbb68d9e5763f6f4068b5' 
  AND token = 'jb/Ypgq7ywgnWB3GMGNnu3Mh6SbH7yLjT5u9iUC4DL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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