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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa91b12db2e7b511716a2923222c9e78ff2e6a7137d4bbbd4c01a66a688e2fc5' 
  AND token = 'P8zy/pS03anV5uAQYWuDbh5o2dMg2OdQL+DoDY1Ismw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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