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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948226c6a448e05c132be1521dfa1f93a98d78e99dae7ac65593600b1f9ed316' 
  AND token = 'HFMU3Ef68bJshSYpNhx1ZC0tMcc6JUDHs6lJSS3D9j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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