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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6c3236c8d781ea2eadf21722e2d296852ac2aea6a18671ae4c7af80f26ab3e' 
  AND token = 'gcKqVN2CVP7aLjsm+407CY4VTHYan9mIhcSI9646T2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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