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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97ba9e89766167059e21a0ccb609f63c7f404408dcedb6039811e3fbccb601b' 
  AND token = 'QpDwfPS3O+KNw3dY0SqUiAsf+SZh7se1PmoYWw6+h7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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