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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0244a651ed9992e3d5938de2ef53157710c6a16d9fb92bb97c33176e2ca8e209' 
  AND token = '/0tFUOunC0j1mIac+ekJ7HcWEzDZDJwPFCEbs+y0w2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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