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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71606e6ddbba4c8b45a358695092a64de7cd90936364314919c8fb63e9096be4' 
  AND token = 'B3rsw0cIPdWx85A5wXQfQ8dkgdiL5l/W4g8TeBvV9l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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