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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e96b69ee2f88585275d672fdf0d8bc2012518eb0cca1990aca01c186d35fd4b' 
  AND token = 'CJp8eFRcUUvWqKrPlVj6m4kUUC4zr3Yk7J0GRkB0LAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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