SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108f4f29d51c6ac0f64ad391e18a4fbbe166208097b53bfb042f994593193322' 
  AND token = 'yIEuD6lm8yBbmigOo7g0pHxM7mXGIdq/C9zZKMRtWUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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