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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46595777c91d1738299b25fd480ad7543fcc733d7b71b8cf8aa29a2e129e307' 
  AND token = 'yKFgLjahpTSSS9cXs3IWoGopvhfNLcbF4fyKXCx8n0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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