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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a59cfd610b6d9d8bb7e7e81d19cb8c7e3cc6e7e441ece007a92f95333bec8e' 
  AND token = 'WBx8/2bgmLx2DFxNrGhrthLJY3ZWi3coSSLdcTyUQiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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