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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b735b0d4f1aeadd7ef29c0fe33ed7e36a529c9f2118e1961fbebd3f6ed35de' 
  AND token = 'WXaGqSHSwT7iH1Iv64qpygRT5pXfXbAy6qTguSA/emk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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