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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5d1fa5510159f1284224fc81af63e2ee827c87f188ee4a9fd901ca1fbd5031' 
  AND token = 'nS7UVCvBN8ZRuleFvjCqIqH3FIzC8vDBaYUqm57iyTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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