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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6429f8fef0e8eb5a902e8a6eb22186568579c37a6b5f2bbf6a4d49861147b411' 
  AND token = '93eXnwdnOPPB8xdW6/NAcg+7ZX3DjnR2sE5V2CZzCSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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