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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e003187b83b9095a55e7b4c55c7926884714f743787da0ebb4c897d78e9fcd5' 
  AND token = 'yykaaWdt1mAm5b1e7DOfJog7xJXCE+XrfMw1He5/yl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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