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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8b40dc4f26677fce4371058d31d03bb5092049782fe87b449a416cc7924a3b' 
  AND token = 'xGDnag4GGiWnvo/T61Di1h5jxJBaR/G+WgSum+8iENs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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