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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bfb7d49801c7a60e5e2d61ed611d73f48b9331555b7e4da877fc2fcfa3cc9e' 
  AND token = 'eEjb8MEw6qpgtm3L0yVR06vbl79mau/QZLdgnOG7ewI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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