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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aeebfc37a77887ffa702cacd1611f40299be4f684cbdf316e56e8faa74e8ebb' 
  AND token = 'rc8YheHVtA/qLvz8zdH/O40Z0CxabBRw2PigkX+NBHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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