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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becb77dd326bc84cc797c34d54e2b49f604e6309b4e0537085bd5940169133f5' 
  AND token = 'tjj/cXs6vm6SSwKU47UT9txfgwpGYh8a5eOXwU8MunM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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