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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1e765a4306027a19c514bcbbac0b4133aa0d79b4f28f64ef310fa981254cd9' 
  AND token = 'vT50egtfB37deXanV7L+O7G8zqIrX5mxf3RpAFd5dNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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