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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9827ee15c73b49c669ad2d05fe7822719602ba002b0171579d52d7ab240fd28' 
  AND token = 'kUn72FaBydgTF1X2ZfQtS44R0W/JY4odaQBjgi/Zu50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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