SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59224b7914b63583a6dc98ad401932e3820e68dd8b130b4b5629a36adaed4c0c' 
  AND token = 'KFC0Ag2U/mRj2v8fGL9j7tHa5zqYjG5V+bsZ2J3EZOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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