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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f5e39552d560289ba9f26bc3e173c183ccc8f07851019bb18dc9f87bade7d4' 
  AND token = 'x50okLKmpAdcj2mits/0ixM2iZe1kv1T4n+il/YngME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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