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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7d92d3cb30a03a9dc33e10b301f4f92a081c5bbb62e4f3579300378b8d60da' 
  AND token = 'hZEPXeDQh+L3j9g9BD39YHXsfDOlWO6gUz8zIEWD0ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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