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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c551c24b3bd6d174421c7d7c2256056323f6ae0ebe83c9fd50bc20b011ed63' 
  AND token = 'GIzYnYREn2K2hsK0g8cyIgJMFkQFyyPkdbbtAKj7VD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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