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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd8560dcc0ef457cb10981edf38cbb0ffcd87f80f25f6b4d7ead48780cc9dbc' 
  AND token = 'NuVCGlOHrSktOYJlPVf3Wy1+T4+0trLmZojqqxwla5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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