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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99147f451f5fa29d56ba9b92edf909e1224b8db6d98e2d108fd387a210ccb1d8' 
  AND token = 'VgkqJ26J686GtCZ0irGMjKk9qG/8jR9JzVasPWAjsrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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