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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cf612110b21380f80f03f08c765a7ad6cc00e1e97d11beae1c38cf11559fc8' 
  AND token = 'GtWpXmE8QiGC7xT8B8zcHcIuykaIJSEC2Rfr5CX+4PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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