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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2547cc79983eaa62c3adab3180e140d4bd5f0f47784564e610262861c6ae5b' 
  AND token = 'ET+wHHy/lQ7uccOyKKpGeF6AJfJuL/7DnisL+zMueCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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