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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c129ed8ddd185391a418dad2f986e0a38e619a6258460e68ba2372be64d75a9' 
  AND token = '8RfzwHkhKsQxnso6Myk0rGGdNCYAvb2rz4FghHVh7Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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