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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b621a65d716a39ccae4935e61495365b445e41213a2b6d92e364abb11dc4a4e' 
  AND token = 'qLxkV0VYRmQhTg+dk1rDEJKdGLNQ3IHed6souKoi+MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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