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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa3a0e8d9aba51357a5c0df137141b50486d30b306131d195626c3211d7552f' 
  AND token = 'B9RfV6iFaMMrLf/+AHb+jgeZITGCqeaGTW4ECsmROfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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