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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9377bf6d48a91fbf36481a3e5f3d4d9f72a5efaf604b07b06b4bbdb15800d07d' 
  AND token = 'Mi9pc4YSJgIgQ80bk7MRtCKUgP4Wyx59tqJGCyrJjJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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