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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2107a088ee2609b3a96b817a46ed0393962dd1fcdbb9108beb685cf85091f96' 
  AND token = 'oAey/tvIdeguTOQs2WOyDQxQKqZAenXGhB1WgtWBCLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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