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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9039129c3ae2e4f72409d7ae076922b97e4a39a8deb9aa7533803b3d6c698cce' 
  AND token = 'kLU24R5m63hP4+7WSGk9gEx//Ngk9WLVKz7YPH1J3tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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