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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3991fd4925c52be529c215ddd824ddbcf36b1ac5b6b997b4346a6799d2e172f1' 
  AND token = 'o+UgBhTo90ymd5aMrMJbSbAAOmG6iGWi2jUGo7kaVOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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