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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f82e9160ad0d693478b9734461afdb90aff551b98b5ae7e3a75f3bb25eb3b29' 
  AND token = '6BcEUuJkbPuvfKEpTbefOUa+AiHt6sj7DLsp/lxXeMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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