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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d576969db8b2a152b7061faa7f32fe391f167398c2d6e8122522bc2434025f' 
  AND token = 'fH1KJf4n2cnLXB/rKRMYccXnlS/ws1iO2YXGE6p+a6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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