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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c7237b6bc482c8ffb699960cfbecf91a3837e744dca6d61454fb587643cc46' 
  AND token = 'sKioNgywWWGhAdenfg84B+afy4qloG6C4rGv1wPvBOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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