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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00988bca54434ab5ece95b6738722878584aa56581e4a613469a8c8cd75ef98' 
  AND token = 'Q4ukQOZLxs5WeSi5uRZnbXOpWCjaV3hxRZ0PGBmpfL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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