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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52841f1ee26d84d98ec1e87a816cc1063020e7d1232a5e5b16c26f56b8e04faf' 
  AND token = 'CqO8peaiu6MceybItOO7aLF0JhLsR+ykVIldaX9w1UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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