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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4812608f116151b6a0e59bbaac8d89e4b3034acf90fe062b445a178d756471d' 
  AND token = 'mXHtXulWpO2VK0DOpHJmoZcdINyzo6+FPfYKpt1DUsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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