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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e25b95df72462c239794f9701ece1046f3e4df44c271d7db754983c35c2295' 
  AND token = '/2S8lFQZkrHZ2hMFKskIgfTWSUJroz2ra9u9LcP2g0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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