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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0d8e831b843258cd1f048b1d326b01a560b94fbe4c81d861833bfb67225112' 
  AND token = 'kBJ8R5WcdZcK7Pel/6fKfk70dF0WgIl9cJU0fgMsbjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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