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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ed34a024771c5d547f907aaf79d035380fe48f64c65503160129e4f0159dd4' 
  AND token = 'VrGLvXBG/DIQY6J6gkD049l8nts+tpeI96q7wEYHSSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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