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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76105e92048a9796548e70149b8476c038d70e0210b1b34de9241e586bf60a56' 
  AND token = 'z7tl92OgsraOsj67DV2cgqjLElX6G3w4xfo6wQFJRRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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