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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f483f98432b347f7c42f67315842c2495b65944847d048784e493b7558c216a' 
  AND token = 'qTw96f+8BNmMV8MYmKro5sOY4juVnNxL946j7ip8rH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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